CA2217650C - Multiple hyperband radiocommunications system - Google Patents
Multiple hyperband radiocommunications system Download PDFInfo
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- CA2217650C CA2217650C CA002217650A CA2217650A CA2217650C CA 2217650 C CA2217650 C CA 2217650C CA 002217650 A CA002217650 A CA 002217650A CA 2217650 A CA2217650 A CA 2217650A CA 2217650 C CA2217650 C CA 2217650C
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- 238000005259 measurement Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 20
- 230000011664 signaling Effects 0.000 claims description 10
- 230000001413 cellular effect Effects 0.000 description 27
- 238000004891 communication Methods 0.000 description 17
- 230000010267 cellular communication Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013500 data storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0059—Convolutional codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1614—Details of the supervisory signal using bitmaps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
According to exemplary embodiments of the present invention, multiple hyperband capable mobile stations and base stations are described. These mobile and base stations support multiple hyperband operations including, for example, mobile assisted channel allocation (MACA), mobile assisted handover (MAHO), cell reselection, traffic channel assignment, control channel location and registration. By bridging multiple hyperbands, service quality can be enhanced.
Description
I
MULTIPLE NYPERBAND RADIOCOMMUNICATIONS SYSTEM
BACKGROUND
The present invention relates to cellular communications systems and, in particular, to a multiple hyperband cellular communications system and multiple hyperband capable mobile stations for operation therein.
North American cellular communications have historically been implemented solely in the 800 MHz Cellular hyperband. 'I'he most recent evolution in cellular communications services involves the adoption of three additional hyperbands for use in handling mobile communications. Of these J = CA 02217650 1997-10-07 -additional hyperbands, only the Personal Communication Services (PCS) hyperband in the 1900 MHz frequency range has been completely defined. With the existence of the new PCS hyperband, different types of subscriptions and or services like speech quality, voice privacy, and encryption may exist for one mobile station from one hyperband to another, or from one frequency band in the Cellular hyperband to another frequency band in the PCS hyperband.
The Cellular hyperband is assigned two telephone frequency bands (commonly referred to as the A f requency band and the B frequency band) for carrying and controlling communications. The PCS hyperband, on the other hand, is specified in the United States of America to include six different frequency bands (A, B, C, D, E and F). Thus, in accordance with EIA/TIA
Interim Standard IS-136 (the "IS-136 specification") as modified by the PN3388-1 specification version of Sept. 9, 1994 project no. 3011-1, eight frequency bands are now available in any given service area to facilitate communications services.
Each one of frequency bands specified for the Cellular and PCS
hyperbands is allocated a plurality of voice or speech channels and at least one access or control channel. The control channel is used to control or supervise the operation of mobile stations by means of information transmitted to and received from the mobile stations. Such information may include incoming call signals, outgoing call signals, page signals, page response signals, location registration signals, voice channel assignments, maintenance instructions, hand-off, and cell selection or reselection instructions as a mobile station travels out of the radio coverage of one cell and into the radio coverage of another cell.
The control or voice channels may operate in either an analog mode, a digital mode, or a combination mode.
The individual frequency bands are typically assigned to, and provided within a hyperband for the service area by only one service company. For example, the A frequency band of the Cellular hyperband is usually reserved for use by non-wire line communications service companies, and the B frequency band is usuaIIy reserved for use by wire line communications service companies.
In some instances, a frequency band assigned to one service company for a given cell or service area may be assigned to a different service company in another cell or service area. It is also recognized that the same service company may provide cellular communications service in multiple frequency bands within either a single hyperband or across multiple hyperbands.
Cellular hyperband mobile stations have historically been configured to operate in a particular one of the available frequency bands within the Cellular hyperband. For example, if the service company providing cellular service to the subscriber is a wire line company, the Cellular hyperband mobile station is configured with the B frequency band as its "home" frequency band. Reciprocal billing arrangements between service companies allow subscribers to place calls over non-home frequency bands in the event the mobile station is roaming.
These non-home calls, however, typically require payment by the subscriber of some form of a surcharge and are therefore undesirable. Furthermore, in the absence of an agreement between service companies, roaming subscribers may not be able to make a call without operator assistance. For the service provider .
use of foreign frequency bands by subscribers results in a potential loss of revenue that the provider would like'to avoid.
The expansion to multiple hyperband communications capabilities as a result of the IS-136 specification has necessitated the development and placement into service of mobile stations that are capable of accessing both the Cellular and PCS hyperbands. Furthermore, the existence of multiple available hyperbands for carrying mobile station communications presents an opportunity for cellular telephone switches to control overlapping or adjacent cells in different hyperbands. It would be beneficial if the celluIar communications system were configured from both the system and terminal point of view to allow multiple hyperband capable mobile stations to operate seamlessly between the available hyperbands. At the same time, however, existing mobile units which are capable of operation only in the Cellular hyperband should enjoy continued support.
MULTIPLE NYPERBAND RADIOCOMMUNICATIONS SYSTEM
BACKGROUND
The present invention relates to cellular communications systems and, in particular, to a multiple hyperband cellular communications system and multiple hyperband capable mobile stations for operation therein.
North American cellular communications have historically been implemented solely in the 800 MHz Cellular hyperband. 'I'he most recent evolution in cellular communications services involves the adoption of three additional hyperbands for use in handling mobile communications. Of these J = CA 02217650 1997-10-07 -additional hyperbands, only the Personal Communication Services (PCS) hyperband in the 1900 MHz frequency range has been completely defined. With the existence of the new PCS hyperband, different types of subscriptions and or services like speech quality, voice privacy, and encryption may exist for one mobile station from one hyperband to another, or from one frequency band in the Cellular hyperband to another frequency band in the PCS hyperband.
The Cellular hyperband is assigned two telephone frequency bands (commonly referred to as the A f requency band and the B frequency band) for carrying and controlling communications. The PCS hyperband, on the other hand, is specified in the United States of America to include six different frequency bands (A, B, C, D, E and F). Thus, in accordance with EIA/TIA
Interim Standard IS-136 (the "IS-136 specification") as modified by the PN3388-1 specification version of Sept. 9, 1994 project no. 3011-1, eight frequency bands are now available in any given service area to facilitate communications services.
Each one of frequency bands specified for the Cellular and PCS
hyperbands is allocated a plurality of voice or speech channels and at least one access or control channel. The control channel is used to control or supervise the operation of mobile stations by means of information transmitted to and received from the mobile stations. Such information may include incoming call signals, outgoing call signals, page signals, page response signals, location registration signals, voice channel assignments, maintenance instructions, hand-off, and cell selection or reselection instructions as a mobile station travels out of the radio coverage of one cell and into the radio coverage of another cell.
The control or voice channels may operate in either an analog mode, a digital mode, or a combination mode.
The individual frequency bands are typically assigned to, and provided within a hyperband for the service area by only one service company. For example, the A frequency band of the Cellular hyperband is usually reserved for use by non-wire line communications service companies, and the B frequency band is usuaIIy reserved for use by wire line communications service companies.
In some instances, a frequency band assigned to one service company for a given cell or service area may be assigned to a different service company in another cell or service area. It is also recognized that the same service company may provide cellular communications service in multiple frequency bands within either a single hyperband or across multiple hyperbands.
Cellular hyperband mobile stations have historically been configured to operate in a particular one of the available frequency bands within the Cellular hyperband. For example, if the service company providing cellular service to the subscriber is a wire line company, the Cellular hyperband mobile station is configured with the B frequency band as its "home" frequency band. Reciprocal billing arrangements between service companies allow subscribers to place calls over non-home frequency bands in the event the mobile station is roaming.
These non-home calls, however, typically require payment by the subscriber of some form of a surcharge and are therefore undesirable. Furthermore, in the absence of an agreement between service companies, roaming subscribers may not be able to make a call without operator assistance. For the service provider .
use of foreign frequency bands by subscribers results in a potential loss of revenue that the provider would like'to avoid.
The expansion to multiple hyperband communications capabilities as a result of the IS-136 specification has necessitated the development and placement into service of mobile stations that are capable of accessing both the Cellular and PCS hyperbands. Furthermore, the existence of multiple available hyperbands for carrying mobile station communications presents an opportunity for cellular telephone switches to control overlapping or adjacent cells in different hyperbands. It would be beneficial if the celluIar communications system were configured from both the system and terminal point of view to allow multiple hyperband capable mobile stations to operate seamlessly between the available hyperbands. At the same time, however, existing mobile units which are capable of operation only in the Cellular hyperband should enjoy continued support.
SUMMARY
The present invention provides a signalling method in a radiocommunication system comprising the steps of:
transmitting a message on a signalling channel of a first hyperband instructing at least one mobile station to perform measurements on at least one frequency; and including, as part of said message, a list of said at least one frequency on which said at least one mobile station is to perform said measurements and a second hyperband associated with said list of frequencies, wherein said measurements are to be performed on said second hyperband.
The present invention also provides a signalling method in a radiocommunication system comprising the steps of:
transmitting a message on a signalling channel of a first hyperband instructing at least one mobile station to perform measurements on at least one frequency; and including, as part of said message, a list of said at least one frequency on which said at least one mobile station is to perform said measurements and a hyperband associated with said list of frequencies.
The present invention also provides a signalling method in a multiple hyperband radiocommunication system comprising the steps of:
receiving, at a mobile station, a message from a fixed part of said radiocommunication system listing at least one frequency on which said mobile station is to perform a measurement and identifying a hyperband associated with said at least one frequency;
performing said measurement by the mobile station on said at least one frequency in said hyperband; and transmitting a measurement value from the mobile station to the fixed part of the radiocommunication system.
The present invention also provides a method for reselecting control channels in a multiple hyperband radiocommunication system comprising the steps of:
transmitting, from a base station, a neighbor list identifying candidate control channels for reselection on a frequency in a first hyperband; and including in said list an identifier specifying at least one control channel in a second hyperband for a mobile station to measure.
4a The present invention also provides a method for reselecting control channels in a multiple hyperband radiocommunication system comprising the steps of:
receiving, in a mobile station and on a first frequency in a first hyperband, a neighbor list identifying candidate control channels for reselection; and measuring, by said mobile station, said candidate control channels on a hyperband identified in said neighbor list.
The present invention also provides a method for assigning traffic channels in a multiple hyperband radiocommunication system comprising the steps of:
transmitting, from a fixed part of said radiocommunication system, a list of channels, each of said channels being associated with an indicated hyperband;
receiving, at a mobile station said list of channels and said hyperband indication;
measuring, by said mobile station on each of said channels in said indicated hyperband;
reporting said measurements to said fixed part of said system; and assigning a channel in one of at least two hyperbands to said mobile station based upon said reported measurements.
According to exemplary embodiments of the present invention, multiple hyperband capable mobile stations and base stations are described. These mobile and base stations support multiple hyperband operations including, for example, mobile assisted channel allocation (MACA), mobile assisted handover (IviAHO), cell reselection, traffic channel assignment, control channel location and registration..
By bridging multiple hyperbands, service quality can be enhanced.
BRIEF DESCRIPTTON OF THE DRAWIlY GS
The foregoing, and other, objects, features and advantages of the present invention will be more readily understood upon reading the following detailed description in conjunction with the drawings in which:
Figure 1 is a cell diagram illustrating an exemplary cell configuration for a multiple hyperband cellular communications system of the present invention;
Figure 2 is a simplified block diagram of a multiple hyperband mobile station programmable with hyperband and frequency band selection criteria in accordance with the present invention;
4b Figures 3(a)-3(h) depict exemplary probability blocks for multiple hyperband control channel location according to an exemplary embodiment of the present invendon;
Figures 4(a) and 4(b) illustrate exemplary messages related to cell reselection acr,ording to an exemplary embodiment of the present invention;
Figures 5(a) and 5(b) illustrate exemplary messages related to MACA
techniques according to an exemplary embodiment of the present invention;
Figure 6 is a flowchart illustrating an exemplary multiple hyperband registration teclinique according to an exemplary embodiment of the present invention;
Figure 7 is an exemplary multiple hyperband handover message accordincy to an exemplary embodiment of the present invention; and Figures 8(a) and 8(b) illustrate exemplary messages related to MAHO
techniques according to an exemplary embodiment of the present invention.
D TAIL DES rArrOx ~ _..r.
The present invention provides a signalling method in a radiocommunication system comprising the steps of:
transmitting a message on a signalling channel of a first hyperband instructing at least one mobile station to perform measurements on at least one frequency; and including, as part of said message, a list of said at least one frequency on which said at least one mobile station is to perform said measurements and a second hyperband associated with said list of frequencies, wherein said measurements are to be performed on said second hyperband.
The present invention also provides a signalling method in a radiocommunication system comprising the steps of:
transmitting a message on a signalling channel of a first hyperband instructing at least one mobile station to perform measurements on at least one frequency; and including, as part of said message, a list of said at least one frequency on which said at least one mobile station is to perform said measurements and a hyperband associated with said list of frequencies.
The present invention also provides a signalling method in a multiple hyperband radiocommunication system comprising the steps of:
receiving, at a mobile station, a message from a fixed part of said radiocommunication system listing at least one frequency on which said mobile station is to perform a measurement and identifying a hyperband associated with said at least one frequency;
performing said measurement by the mobile station on said at least one frequency in said hyperband; and transmitting a measurement value from the mobile station to the fixed part of the radiocommunication system.
The present invention also provides a method for reselecting control channels in a multiple hyperband radiocommunication system comprising the steps of:
transmitting, from a base station, a neighbor list identifying candidate control channels for reselection on a frequency in a first hyperband; and including in said list an identifier specifying at least one control channel in a second hyperband for a mobile station to measure.
4a The present invention also provides a method for reselecting control channels in a multiple hyperband radiocommunication system comprising the steps of:
receiving, in a mobile station and on a first frequency in a first hyperband, a neighbor list identifying candidate control channels for reselection; and measuring, by said mobile station, said candidate control channels on a hyperband identified in said neighbor list.
The present invention also provides a method for assigning traffic channels in a multiple hyperband radiocommunication system comprising the steps of:
transmitting, from a fixed part of said radiocommunication system, a list of channels, each of said channels being associated with an indicated hyperband;
receiving, at a mobile station said list of channels and said hyperband indication;
measuring, by said mobile station on each of said channels in said indicated hyperband;
reporting said measurements to said fixed part of said system; and assigning a channel in one of at least two hyperbands to said mobile station based upon said reported measurements.
According to exemplary embodiments of the present invention, multiple hyperband capable mobile stations and base stations are described. These mobile and base stations support multiple hyperband operations including, for example, mobile assisted channel allocation (MACA), mobile assisted handover (IviAHO), cell reselection, traffic channel assignment, control channel location and registration..
By bridging multiple hyperbands, service quality can be enhanced.
BRIEF DESCRIPTTON OF THE DRAWIlY GS
The foregoing, and other, objects, features and advantages of the present invention will be more readily understood upon reading the following detailed description in conjunction with the drawings in which:
Figure 1 is a cell diagram illustrating an exemplary cell configuration for a multiple hyperband cellular communications system of the present invention;
Figure 2 is a simplified block diagram of a multiple hyperband mobile station programmable with hyperband and frequency band selection criteria in accordance with the present invention;
4b Figures 3(a)-3(h) depict exemplary probability blocks for multiple hyperband control channel location according to an exemplary embodiment of the present invendon;
Figures 4(a) and 4(b) illustrate exemplary messages related to cell reselection acr,ording to an exemplary embodiment of the present invention;
Figures 5(a) and 5(b) illustrate exemplary messages related to MACA
techniques according to an exemplary embodiment of the present invention;
Figure 6 is a flowchart illustrating an exemplary multiple hyperband registration teclinique according to an exemplary embodiment of the present invention;
Figure 7 is an exemplary multiple hyperband handover message accordincy to an exemplary embodiment of the present invention; and Figures 8(a) and 8(b) illustrate exemplary messages related to MAHO
techniques according to an exemplary embodiment of the present invention.
D TAIL DES rArrOx ~ _..r.
5 Reference is now made to Figure 1 wherein there is shown a cell diagram illustrating an exemplary cell configuration for a multiple hyperband cellular communications system according to the present invention. An arbitrary geographic area (hereinafter "the service area") is divided into a plurality of cells 10-18 and 20-26 utilizing both the Cellular and PCS hyperbands. The cells 10-18 are represented by hexagrams and comprise communications cells wherein one or both of the separate frequency bands (A and B) available in the Cellular hyperband are provided via multiple channels. Cells 20-26, on the other hand, are represented by circles and comprise communications cells one or more of the six separate frequency bands (A through F) of radio frequency cellular communications are provided to mobile stations via multiple channels in the PCS
hyperband.
Each of the Cellular hyperband cells 10-18 includes at least one base station 28 configured to facilitate communications over certain channels in at least one of the two available Cellular hyperband frequency bands. Similarly, each of the PCS hyperband cells 20-26 includes at least one PCS base station configured to facilitate communications over certain channels in at least one of the six available PCS hyperband frequency bands. It will, of course, be understood that each cell 10-18 and each cell 20-26 may include more than one base station 28 and 30, respectively, if for example, different service companies are providing cellular communications services on different frequency bands within the same cell.
The base stations 28 and 30 are illustrated as being positionally located at or near the center of each of the cells 10-18 and 20-26, respectively.
However, depending on geography and other known factors, the base stations 28 and 30 may instead be located at or near the periphery of, or otherwise away from the -, _ -. - -CA 0_2217650..199 - 7-10-07 centers of, each of the cells 10-18 and 20-26. In such instances, the base stations 28 and 30 may broadcast and communicate with mobile stations 32 located within the cells 10-18 and 20-26 using directional rather than omni-directional antennas.
Each one of the base stations 28 and 30 includes a transmitter, a receiver, and a base station controller connected to the antenna in a manner and with a configuration well known in the art.
There are a number of mobile stations 32 shown operating within the service area of the system of the present invention. These mobile stations 32 each possess the requisite functionality for operating in both the Cellular hyperband and the PCS hyperband (i.e., they are multiple hyperband communications capable). The configuration and operation of the mobile stations 32 will be described in more detail herein with respect to Figure 2. It will, of course, be understood that existing Cellular hyperband only mobile stations (not shown) are compatible with the system of the present invention, but will only be able to communicate with Celiular hyperband base stations 28.
Reference is now made to Figure 2 wherein there is shown a simplified block diagram of a multiple hyperband mobile station 32 according to an exemplary embodiment of the present invention. The mobile station 32 includes a processor (CPU) 34 connected to a plurality of transceivers 36. The transceivers 36 are each configured to operate in the frequency bands and channels of a different hyperband. For example, the transceiver 36(1) functions on multiple channels in at least one of the frequency bands of the 800 MHz frequency range, and is thus utilized by the mobile station 32 for communicating over the Cellular hyperband. The transceiver 36(2), on the other hand, functions on multiple channels in at least one of the frequency bands of the 1900 MHz frequency range, and is thus utilized by the mobile station 32 for communicating over the PCS hyperband. The remaining transceivers 36(3) and 36(4), if included, function in other frequency ranges; for example, comprising those additional frequency ranges identified by the IS-136 specification for other soon to be made available hyperbands. By means of an output signal from the processor 34, the frequency band and precise channel therein on which the transceivers 36 operate for communications may be selected. An antenna 38 is connected to the transceivers 36 for transmitting and receiving radio communications (both voice and data) over the cellular communications network utilizing, for example, the base stations 28 and 30 of Figure 1. A data storage device 40 (preferably in the form of a read only memory - ROM - and a random access memory - RAM) is also connected to the processor 34. The data storage device 40 is used for storing programs and data executed by the processor 34 in controlling operation of the mobile station 32. lfiere are other components 41 included in the mobile station 32 (like a handset, keypad, etc.) and not specifically shown in Figure 2 whose nature, operation and interconnection with the illustrated components are well known to those skilled in the art.
The primary modes of operation of the mobile station 32 of interest herein are: an idle operating mode, wherein the mobile station awaits use through either the receipt or initiation of a call; and, an on call operating mode, wherein the mobile station is being used by the subscriber to engage in a call. Both of these modes will now be described in more detail below with an emphasis on functions performed by the base stations and the mobile stations to provide seamless operation across different hyperbands.
When in the idle state, a mobile station tunes to and then continuously monitors the strongest control channel at its known frequency (generally, the control channel of the cell in which the mobile station is located at that moment) and may receive or initiate a telephone call through the corresponding base station. When moving between cells while in the idle state, the mobile station will eventually "lose" radio connection on the control channel of the "old"
cell and tune to the control channel of the "new" cell. The initial tuning to, and the change of, control channel are both accomplished automatically by scanning all the control channels at their known frequencies in operation in the cellular system to find the "best" control channel. When a control channel with good reception quality is found, the mobile station remains tuned to this channel until _ ~---. CA 02217650 1997-10-07 the quality deteriorates again. In this manner, all mobile stations are nearly always "in touch" with the system.
As can be seen from the foregoing, speedy location of control channels is significant with respect to overall system performance. If the control channels are not located on predetermined and fixed frequencies, then the mobile stations have to search for the control channels. As described in the above-incorporated U.S. Patent Application Serial No. 08/331,711 entitled "A Method and Apparatus for Locating a Digital Control Channel in a Radiocommunication System" and filed on October 31,1994 (hereafter referred to as the "control channel locator application"), control channel location is expedited by, for example, prescribing a search pattern based on a relative likelihood of finding a control channel on a particular frequency or group of frequencies. According to exemplary embodiments of the present invention, this concept can be extended to multiple hyperband systems as follows.
For each of the frequency bands in each of the hyperbands available, e.g., bands A and B for the Cellular hyperband and bands A-F for the PCS
hyperband, channels are grouped into probability blocks which are ranked in accordance with the relative likelihood of finding the digital control channel in each block. Exemplary groupings are illustrated in Figures 3(a)-3(h). These groupings can be stored in the data storage device 40 of each multiple hyperband capable mobile station 32. To locate a control channel, a frequency band within one of the available hyperbands in which a control channel is desired is selected, as for example described in the above-incorporated patent application entitled "Mobile Station Preferences in a Multiple Hyperband Capable Communications System". Then, a mobile unit can look for a digital control channel within a highest ranked probability block, followed by a second highest ranked probability block and so on, until one is located. Each channel can be examined by the mobile station as described in the control channel locator patent application.
Having located and tuned to a control channel, but while still in the idle operating mode, the mobile station 32 receives a neighbor list from the cellular system via a communications broadcast from the base stations 28 or 30 identifying cell neighbors (i.e., other base stations) that are available for server selection. The mobile station can measure on one or more of the channels to identify a new server when, for example, its current server no longer satisfies certain transmission criteria. For multiple hyperband capable mobile stations 32, the neighbor list can include information pertaining to servers operating on the Cellular hyperband, as well as servers operating on the PCS hyperband. For example, the system can transmit a message having the exemplary format illustrated in Figure 4(a) to identify, as part of a neighbor list, one or more servers in the same hyperband as the control channel to which the mobile station 32 is currently listening. Similarly, for candidate servers on other hyperbands, the system can transmit a message having the exemplary format seen in Figure 4(b). Although the exemplary message formats of Figures 4(a) and 4(b) provide a two bit length field for identifying a hyperband (e.g., 00 = Cellular hyperband, 01 = PCS hyperband, others reserved), those sldlled in the art will appreciate that additional bits could be used to identify more than four different hyperbands. Alternatively, a single message can be transmitted which identifies a particular hyperband associated with each channel to be measured.
Registration is performed in radiocommunication systems to, among other reasons, inform the system of each mobile's general location, e.g., in which cell or cells a mobile station is currently located. Registration can be performed periodically or after certain events occur, such as power up or power down, or both periodically and after certain events occur. Once a mobile station has registered with the system, the system can then direct pages to the mobile station on the appropriate control channel(s). However, the advent of multiple hyperbands adds further complexities to this issue. As described above, an idle mobile station 32 can switch between different hyperbands by way of cell reselection according to exemplary embodiments of the present invention. Thus, according to an exemplary embodiment of the.present invention illustrated in Figure 6, a mobile station which switches hyperbands will also register with the system so that the system knows on which hyperband to issue subsequent paging messages. For example, if mobile station 32 is first listening to a control channel on the Cellular hyperband transmitted by a base station 28 and subsequently begins listening to a control channel on the PCS hyperband 5 transmitted by a base station 30, then that mobile station will issue a registration message to the system providing, among other data, an indicator of the new hyperband within which it is now listening. In this way, the system need not page the mobile station 32 using base stations 28.
Figure 6 is a flowchart illustrating an example of registration according to 10 the present invention. Therein, the mobile station determines if a period has expired for registration at block 60. If so, then the mobile sends a registration message to the system at block 62. The mobile station checks to see whether the current control channel is within the same hyperband as the control channel to which the mobile station was listening at the time of the last registration message at block 64. If not, then the mobile station will also register at block 62.
Otherwise, no registration occurs during this cycle. Of course those slalled in the art will readily appreciate that Figure 6 is only an example since this exemplary embodiment is readily combinable with other conventional forms of registration as mentioned above. For example, if a system did not use periodic registration, then block 60 could be replaced by other event-driven types of registration.
Another function which can be performed by idle mobile stations 32 is mobile assisted channel allocation (MACA). Using a MACA technique, idle mobile stations are instructed to measure either or both of the word error rate or received signal strength on channels designated by the serving base station 28 or 30. The base station can, for example, instruct these idle mobile stations to perform such measurements via transmission overhead signalling to all of the mobile stations, e.g., the broadcast control channel (BCCH). Having made measurements on the identified frequencies, the mobile stations 32 then report this information to the base station so that the information can be used in allocating channels (traffic and/or control channels) throughout the system.
For example, the system can send a list of up to eight frequencies on the BCCH which all idle mobile stations shall measure the signal strength of and report to the base station. The number of frequencies to be measured can be variable, as can the selection of method for determining signal quality. As with the foregoing exemplary embodiment related to cell reselection, a message such as that seen in Figure 5(a) can be transmitted to a mobile station instructing to measure on channels within a current, serving hyperband. An analogous message, an exemplary version thereof depicted in Figure 5(b), can be transmitted to the mobile for measuring on channels which are in a different hyperband. Alternatively, a single message identifying the specific hyperband, whether serving or other, associated with each frequency to be measured can be issued by the system. The mobile stations can be instructed by the system to measure each listed frequency a predetermined number of times, e.g., 4 times, with a predetermined spacing between measurements, e.g., 20ms. A resultant average of either signal strength or error rate can then be calculated and returned to the base station.
As another example, the idle mobile station can be instructed by the system to measure the quality of the serving digital control channel (DCC), i.e., the control channel that the idle mobile station is locked and listening to, by performing a running average over a last predetermined number, e.g., 32, of readings of its associated paging channel (PCH) for both signal quality, e.g., word error rate, and signal strength, e.g., RSS. The mobile station can be instructed to perform either or both of the above described measurements continuously or just before the idle mobile station accesses the system.
The system can also instruct the idle mobile stations regarding when reports should be sent informing the system of the measurement results and what information these reports should contain. For example, the idle mobile station(s) can be instructed to inform the system of the measurement results when they make a predetermined type of access to the system, e.g., a registration access and/or an origination access. In such reports, the mobile station can be instructed to include information pertaining to, for example, one or more of:
what type of measurements were made (i.e., the DCC or other channels or both), whether the report is based on a full measurement interval and the measurement results themselves.
In the on call operating mode, mobile station 32 may experience a degradation in connection signal quality due to the changing interference conditions caused by its own movement and/or other system variations. Once a connection's quality drops below an acceptable threshold, the mobile station will be instructed to changeover to a new frequency to continue the connection. The techniques for handling this changeover are known as handover or handoff techniques and describe the interaction between the original serving base station, candidate replacement serving base stations and the mobile station being served.
Many different types of handover techniques are known and used in radiocommunication systems today, such as so-called soft handover wherein both an original serving base station and the replacement serving base station transmit the same information to the mobile station for a period of time to create a seamless transfer of the connection, as well as transmission diversity.
According to exemplary embodiments of the present invention, a multiple hyperband capable mobile station can be handed over from a traffic channel in one hyperband to a traffic channel in another hyperband. For example, referring to Figure 1, a mobile station 32 whicli is in the midst of a connection being served by PCS hyperband base station 30 in cell 26 moves into cell 18. Since base station 28 in cell 18 can now provide a better quality connection to this particular mobile station, it is desirable to handover the connection from the PCS
hyperband base station 30 in cell 26 to the Cellular hyperband base station 28 in cell 18. This can be accomplished, for example, by transmitting a signal from base station 30 in cell 26 to the mobile station 32 informing the mobile station of the new frequency and hyperband to which it should tune to continue the W'O 96/33589 PCr/SE96/00511 connection. As an example, the handover message can have the format shown in Figure 7. Note that this exemplary handover message implies the current hyperband when the field for a target hyperband is omitted. Those sldlled in the art will appreciate that a hyperband indicator, regardless of whether the target hyperband is the current or a different hyperband, for each handover message could alternatively be provided.
One way to identify the particular new frequency and hyperband to which a handover should be made is known as mobile assisted handover (MAHO). By way of MAHO techniques, the mobile station can assist in the selection of an appropriate handover frequency and hyperband by measuring on candidate traffic channels and reporting these measurements to the base station. For example, a connected mobile station can measure on other frequencies during time slots in which it is idle, i.e., those which are not being used to support the connection.
According to the present invention, the mobile station receives a MAHO list identifying cell neighbors that the mobile station should scan for and measure on for purposes of effectuating a hand-off when the mobile station moves from cell to cell. This list informs the mobile station of both the channel and the hyperband on which to measure.
Figures 8(a) and 8(b) depict exemplary message formats for instructing a mobile to measure channels disposed in its current hyperband and for instructing a mobile station to measure channels disposed in a hyperband other than that to which it is currently listening, respectively. Alternatively, a single message format could be provided which identifies specific channels and hyperbands without relying on absence of an indicator as an assumption that the current hyperband is implied.
The above-described exemplary embodiments are intended to be illustrative in all respects, rather than restrictive, of the present invention. Thus the present invention is capable of many variations in detailed implementation that can be derived from the description contained herein by a person s1dlled in the art. For example although the present invention has been described with respect to operation in the Cellular and PCS hyperbands, it will be understood that the disclosed invention may be implemented in and across any of a number of available hyperbands. All such variations and modifications are considered to be within the scope and spirit of the present invention as defined by the following claims.
hyperband.
Each of the Cellular hyperband cells 10-18 includes at least one base station 28 configured to facilitate communications over certain channels in at least one of the two available Cellular hyperband frequency bands. Similarly, each of the PCS hyperband cells 20-26 includes at least one PCS base station configured to facilitate communications over certain channels in at least one of the six available PCS hyperband frequency bands. It will, of course, be understood that each cell 10-18 and each cell 20-26 may include more than one base station 28 and 30, respectively, if for example, different service companies are providing cellular communications services on different frequency bands within the same cell.
The base stations 28 and 30 are illustrated as being positionally located at or near the center of each of the cells 10-18 and 20-26, respectively.
However, depending on geography and other known factors, the base stations 28 and 30 may instead be located at or near the periphery of, or otherwise away from the -, _ -. - -CA 0_2217650..199 - 7-10-07 centers of, each of the cells 10-18 and 20-26. In such instances, the base stations 28 and 30 may broadcast and communicate with mobile stations 32 located within the cells 10-18 and 20-26 using directional rather than omni-directional antennas.
Each one of the base stations 28 and 30 includes a transmitter, a receiver, and a base station controller connected to the antenna in a manner and with a configuration well known in the art.
There are a number of mobile stations 32 shown operating within the service area of the system of the present invention. These mobile stations 32 each possess the requisite functionality for operating in both the Cellular hyperband and the PCS hyperband (i.e., they are multiple hyperband communications capable). The configuration and operation of the mobile stations 32 will be described in more detail herein with respect to Figure 2. It will, of course, be understood that existing Cellular hyperband only mobile stations (not shown) are compatible with the system of the present invention, but will only be able to communicate with Celiular hyperband base stations 28.
Reference is now made to Figure 2 wherein there is shown a simplified block diagram of a multiple hyperband mobile station 32 according to an exemplary embodiment of the present invention. The mobile station 32 includes a processor (CPU) 34 connected to a plurality of transceivers 36. The transceivers 36 are each configured to operate in the frequency bands and channels of a different hyperband. For example, the transceiver 36(1) functions on multiple channels in at least one of the frequency bands of the 800 MHz frequency range, and is thus utilized by the mobile station 32 for communicating over the Cellular hyperband. The transceiver 36(2), on the other hand, functions on multiple channels in at least one of the frequency bands of the 1900 MHz frequency range, and is thus utilized by the mobile station 32 for communicating over the PCS hyperband. The remaining transceivers 36(3) and 36(4), if included, function in other frequency ranges; for example, comprising those additional frequency ranges identified by the IS-136 specification for other soon to be made available hyperbands. By means of an output signal from the processor 34, the frequency band and precise channel therein on which the transceivers 36 operate for communications may be selected. An antenna 38 is connected to the transceivers 36 for transmitting and receiving radio communications (both voice and data) over the cellular communications network utilizing, for example, the base stations 28 and 30 of Figure 1. A data storage device 40 (preferably in the form of a read only memory - ROM - and a random access memory - RAM) is also connected to the processor 34. The data storage device 40 is used for storing programs and data executed by the processor 34 in controlling operation of the mobile station 32. lfiere are other components 41 included in the mobile station 32 (like a handset, keypad, etc.) and not specifically shown in Figure 2 whose nature, operation and interconnection with the illustrated components are well known to those skilled in the art.
The primary modes of operation of the mobile station 32 of interest herein are: an idle operating mode, wherein the mobile station awaits use through either the receipt or initiation of a call; and, an on call operating mode, wherein the mobile station is being used by the subscriber to engage in a call. Both of these modes will now be described in more detail below with an emphasis on functions performed by the base stations and the mobile stations to provide seamless operation across different hyperbands.
When in the idle state, a mobile station tunes to and then continuously monitors the strongest control channel at its known frequency (generally, the control channel of the cell in which the mobile station is located at that moment) and may receive or initiate a telephone call through the corresponding base station. When moving between cells while in the idle state, the mobile station will eventually "lose" radio connection on the control channel of the "old"
cell and tune to the control channel of the "new" cell. The initial tuning to, and the change of, control channel are both accomplished automatically by scanning all the control channels at their known frequencies in operation in the cellular system to find the "best" control channel. When a control channel with good reception quality is found, the mobile station remains tuned to this channel until _ ~---. CA 02217650 1997-10-07 the quality deteriorates again. In this manner, all mobile stations are nearly always "in touch" with the system.
As can be seen from the foregoing, speedy location of control channels is significant with respect to overall system performance. If the control channels are not located on predetermined and fixed frequencies, then the mobile stations have to search for the control channels. As described in the above-incorporated U.S. Patent Application Serial No. 08/331,711 entitled "A Method and Apparatus for Locating a Digital Control Channel in a Radiocommunication System" and filed on October 31,1994 (hereafter referred to as the "control channel locator application"), control channel location is expedited by, for example, prescribing a search pattern based on a relative likelihood of finding a control channel on a particular frequency or group of frequencies. According to exemplary embodiments of the present invention, this concept can be extended to multiple hyperband systems as follows.
For each of the frequency bands in each of the hyperbands available, e.g., bands A and B for the Cellular hyperband and bands A-F for the PCS
hyperband, channels are grouped into probability blocks which are ranked in accordance with the relative likelihood of finding the digital control channel in each block. Exemplary groupings are illustrated in Figures 3(a)-3(h). These groupings can be stored in the data storage device 40 of each multiple hyperband capable mobile station 32. To locate a control channel, a frequency band within one of the available hyperbands in which a control channel is desired is selected, as for example described in the above-incorporated patent application entitled "Mobile Station Preferences in a Multiple Hyperband Capable Communications System". Then, a mobile unit can look for a digital control channel within a highest ranked probability block, followed by a second highest ranked probability block and so on, until one is located. Each channel can be examined by the mobile station as described in the control channel locator patent application.
Having located and tuned to a control channel, but while still in the idle operating mode, the mobile station 32 receives a neighbor list from the cellular system via a communications broadcast from the base stations 28 or 30 identifying cell neighbors (i.e., other base stations) that are available for server selection. The mobile station can measure on one or more of the channels to identify a new server when, for example, its current server no longer satisfies certain transmission criteria. For multiple hyperband capable mobile stations 32, the neighbor list can include information pertaining to servers operating on the Cellular hyperband, as well as servers operating on the PCS hyperband. For example, the system can transmit a message having the exemplary format illustrated in Figure 4(a) to identify, as part of a neighbor list, one or more servers in the same hyperband as the control channel to which the mobile station 32 is currently listening. Similarly, for candidate servers on other hyperbands, the system can transmit a message having the exemplary format seen in Figure 4(b). Although the exemplary message formats of Figures 4(a) and 4(b) provide a two bit length field for identifying a hyperband (e.g., 00 = Cellular hyperband, 01 = PCS hyperband, others reserved), those sldlled in the art will appreciate that additional bits could be used to identify more than four different hyperbands. Alternatively, a single message can be transmitted which identifies a particular hyperband associated with each channel to be measured.
Registration is performed in radiocommunication systems to, among other reasons, inform the system of each mobile's general location, e.g., in which cell or cells a mobile station is currently located. Registration can be performed periodically or after certain events occur, such as power up or power down, or both periodically and after certain events occur. Once a mobile station has registered with the system, the system can then direct pages to the mobile station on the appropriate control channel(s). However, the advent of multiple hyperbands adds further complexities to this issue. As described above, an idle mobile station 32 can switch between different hyperbands by way of cell reselection according to exemplary embodiments of the present invention. Thus, according to an exemplary embodiment of the.present invention illustrated in Figure 6, a mobile station which switches hyperbands will also register with the system so that the system knows on which hyperband to issue subsequent paging messages. For example, if mobile station 32 is first listening to a control channel on the Cellular hyperband transmitted by a base station 28 and subsequently begins listening to a control channel on the PCS hyperband 5 transmitted by a base station 30, then that mobile station will issue a registration message to the system providing, among other data, an indicator of the new hyperband within which it is now listening. In this way, the system need not page the mobile station 32 using base stations 28.
Figure 6 is a flowchart illustrating an example of registration according to 10 the present invention. Therein, the mobile station determines if a period has expired for registration at block 60. If so, then the mobile sends a registration message to the system at block 62. The mobile station checks to see whether the current control channel is within the same hyperband as the control channel to which the mobile station was listening at the time of the last registration message at block 64. If not, then the mobile station will also register at block 62.
Otherwise, no registration occurs during this cycle. Of course those slalled in the art will readily appreciate that Figure 6 is only an example since this exemplary embodiment is readily combinable with other conventional forms of registration as mentioned above. For example, if a system did not use periodic registration, then block 60 could be replaced by other event-driven types of registration.
Another function which can be performed by idle mobile stations 32 is mobile assisted channel allocation (MACA). Using a MACA technique, idle mobile stations are instructed to measure either or both of the word error rate or received signal strength on channels designated by the serving base station 28 or 30. The base station can, for example, instruct these idle mobile stations to perform such measurements via transmission overhead signalling to all of the mobile stations, e.g., the broadcast control channel (BCCH). Having made measurements on the identified frequencies, the mobile stations 32 then report this information to the base station so that the information can be used in allocating channels (traffic and/or control channels) throughout the system.
For example, the system can send a list of up to eight frequencies on the BCCH which all idle mobile stations shall measure the signal strength of and report to the base station. The number of frequencies to be measured can be variable, as can the selection of method for determining signal quality. As with the foregoing exemplary embodiment related to cell reselection, a message such as that seen in Figure 5(a) can be transmitted to a mobile station instructing to measure on channels within a current, serving hyperband. An analogous message, an exemplary version thereof depicted in Figure 5(b), can be transmitted to the mobile for measuring on channels which are in a different hyperband. Alternatively, a single message identifying the specific hyperband, whether serving or other, associated with each frequency to be measured can be issued by the system. The mobile stations can be instructed by the system to measure each listed frequency a predetermined number of times, e.g., 4 times, with a predetermined spacing between measurements, e.g., 20ms. A resultant average of either signal strength or error rate can then be calculated and returned to the base station.
As another example, the idle mobile station can be instructed by the system to measure the quality of the serving digital control channel (DCC), i.e., the control channel that the idle mobile station is locked and listening to, by performing a running average over a last predetermined number, e.g., 32, of readings of its associated paging channel (PCH) for both signal quality, e.g., word error rate, and signal strength, e.g., RSS. The mobile station can be instructed to perform either or both of the above described measurements continuously or just before the idle mobile station accesses the system.
The system can also instruct the idle mobile stations regarding when reports should be sent informing the system of the measurement results and what information these reports should contain. For example, the idle mobile station(s) can be instructed to inform the system of the measurement results when they make a predetermined type of access to the system, e.g., a registration access and/or an origination access. In such reports, the mobile station can be instructed to include information pertaining to, for example, one or more of:
what type of measurements were made (i.e., the DCC or other channels or both), whether the report is based on a full measurement interval and the measurement results themselves.
In the on call operating mode, mobile station 32 may experience a degradation in connection signal quality due to the changing interference conditions caused by its own movement and/or other system variations. Once a connection's quality drops below an acceptable threshold, the mobile station will be instructed to changeover to a new frequency to continue the connection. The techniques for handling this changeover are known as handover or handoff techniques and describe the interaction between the original serving base station, candidate replacement serving base stations and the mobile station being served.
Many different types of handover techniques are known and used in radiocommunication systems today, such as so-called soft handover wherein both an original serving base station and the replacement serving base station transmit the same information to the mobile station for a period of time to create a seamless transfer of the connection, as well as transmission diversity.
According to exemplary embodiments of the present invention, a multiple hyperband capable mobile station can be handed over from a traffic channel in one hyperband to a traffic channel in another hyperband. For example, referring to Figure 1, a mobile station 32 whicli is in the midst of a connection being served by PCS hyperband base station 30 in cell 26 moves into cell 18. Since base station 28 in cell 18 can now provide a better quality connection to this particular mobile station, it is desirable to handover the connection from the PCS
hyperband base station 30 in cell 26 to the Cellular hyperband base station 28 in cell 18. This can be accomplished, for example, by transmitting a signal from base station 30 in cell 26 to the mobile station 32 informing the mobile station of the new frequency and hyperband to which it should tune to continue the W'O 96/33589 PCr/SE96/00511 connection. As an example, the handover message can have the format shown in Figure 7. Note that this exemplary handover message implies the current hyperband when the field for a target hyperband is omitted. Those sldlled in the art will appreciate that a hyperband indicator, regardless of whether the target hyperband is the current or a different hyperband, for each handover message could alternatively be provided.
One way to identify the particular new frequency and hyperband to which a handover should be made is known as mobile assisted handover (MAHO). By way of MAHO techniques, the mobile station can assist in the selection of an appropriate handover frequency and hyperband by measuring on candidate traffic channels and reporting these measurements to the base station. For example, a connected mobile station can measure on other frequencies during time slots in which it is idle, i.e., those which are not being used to support the connection.
According to the present invention, the mobile station receives a MAHO list identifying cell neighbors that the mobile station should scan for and measure on for purposes of effectuating a hand-off when the mobile station moves from cell to cell. This list informs the mobile station of both the channel and the hyperband on which to measure.
Figures 8(a) and 8(b) depict exemplary message formats for instructing a mobile to measure channels disposed in its current hyperband and for instructing a mobile station to measure channels disposed in a hyperband other than that to which it is currently listening, respectively. Alternatively, a single message format could be provided which identifies specific channels and hyperbands without relying on absence of an indicator as an assumption that the current hyperband is implied.
The above-described exemplary embodiments are intended to be illustrative in all respects, rather than restrictive, of the present invention. Thus the present invention is capable of many variations in detailed implementation that can be derived from the description contained herein by a person s1dlled in the art. For example although the present invention has been described with respect to operation in the Cellular and PCS hyperbands, it will be understood that the disclosed invention may be implemented in and across any of a number of available hyperbands. All such variations and modifications are considered to be within the scope and spirit of the present invention as defined by the following claims.
Claims (5)
1. A signalling method in a multiple hyperband radiocommunication system comprising the steps of:
receiving, at a mobile station, a message from a fixed part of said radiocommunication system listing at least one frequency on which said mobile station is to perform a measurement and identifying a hyperband associated with said at least one frequency;
performing said measurement by the mobile station on said at least one frequency in said hyperband; and transmitting a measurement value from the mobile station to the fixed part of the radiocommunication system.
receiving, at a mobile station, a message from a fixed part of said radiocommunication system listing at least one frequency on which said mobile station is to perform a measurement and identifying a hyperband associated with said at least one frequency;
performing said measurement by the mobile station on said at least one frequency in said hyperband; and transmitting a measurement value from the mobile station to the fixed part of the radiocommunication system.
2. The signalling method of claim 1, wherein said measurement is a signal strength measurement.
3. The signalling method of claim 1, wherein said measurement is a word error rate measurement.
4. The signalling method of claim 1, 2 or 3, wherein said at least one frequency is a traffic channel frequency.
5. A method for assigning traffic channels in a multiple hyperband radiocommunication system comprising the steps of:
transmitting, from a fixed part of said radiocommunication system, a list of channels, each of said channels being associated with an indicated hyperband;
receiving, at a mobile station said list of channels and said hyperband indication;
measuring, by said mobile station on each of said channels in said indicated hyperband;
reporting said measurements to said fixed part of said system; and assigning a channel in one of at least two hyperbands to said mobile station based upon said reported measurements.
transmitting, from a fixed part of said radiocommunication system, a list of channels, each of said channels being associated with an indicated hyperband;
receiving, at a mobile station said list of channels and said hyperband indication;
measuring, by said mobile station on each of said channels in said indicated hyperband;
reporting said measurements to said fixed part of said system; and assigning a channel in one of at least two hyperbands to said mobile station based upon said reported measurements.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002555598A CA2555598C (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
| CA002556505A CA2556505A1 (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
| CA002555681A CA2555681C (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/425,051 | 1995-04-19 | ||
| US08/425,051 US6259915B1 (en) | 1993-02-05 | 1995-04-19 | Multiple hyperband mobile and base stations |
| PCT/SE1996/000511 WO1996033589A2 (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002555681A Division CA2555681C (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
| CA002555598A Division CA2555598C (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
| CA002556505A Division CA2556505A1 (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
Publications (2)
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| CA2217650A1 CA2217650A1 (en) | 1996-10-24 |
| CA2217650C true CA2217650C (en) | 2009-02-03 |
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| CA002217650A Expired - Lifetime CA2217650C (en) | 1995-04-19 | 1996-04-18 | Multiple hyperband radiocommunications system |
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| US (1) | US6259915B1 (en) |
| KR (3) | KR100473309B1 (en) |
| CN (4) | CN1242631C (en) |
| AU (1) | AU714335B2 (en) |
| BR (1) | BR9608327A (en) |
| CA (1) | CA2217650C (en) |
| MX (1) | MX9707867A (en) |
| WO (1) | WO1996033589A2 (en) |
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1995
- 1995-04-19 US US08/425,051 patent/US6259915B1/en not_active Expired - Lifetime
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1996
- 1996-04-18 CA CA002217650A patent/CA2217650C/en not_active Expired - Lifetime
- 1996-04-18 CN CNB031557910A patent/CN1242631C/en not_active Expired - Lifetime
- 1996-04-18 KR KR10-2003-7007069A patent/KR100473309B1/en not_active IP Right Cessation
- 1996-04-18 CN CNB031557902A patent/CN1254129C/en not_active Expired - Lifetime
- 1996-04-18 KR KR1019970707356A patent/KR100470374B1/en not_active IP Right Cessation
- 1996-04-18 AU AU54126/96A patent/AU714335B2/en not_active Expired
- 1996-04-18 WO PCT/SE1996/000511 patent/WO1996033589A2/en active IP Right Grant
- 1996-04-18 KR KR10-2003-7013498A patent/KR100450160B1/en not_active IP Right Cessation
- 1996-04-18 CN CNB961946202A patent/CN1153497C/en not_active Expired - Lifetime
- 1996-04-18 CN CNB031557899A patent/CN1254128C/en not_active Expired - Lifetime
- 1996-04-18 BR BR9608327A patent/BR9608327A/en not_active IP Right Cessation
- 1996-04-18 MX MX9707867A patent/MX9707867A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN1496149A (en) | 2004-05-12 |
| MX9707867A (en) | 1997-11-29 |
| CN1496148A (en) | 2004-05-12 |
| CN1254129C (en) | 2006-04-26 |
| KR100473309B1 (en) | 2005-03-14 |
| AU714335B2 (en) | 1999-12-23 |
| CN1153497C (en) | 2004-06-09 |
| CN1187281A (en) | 1998-07-08 |
| CN1254128C (en) | 2006-04-26 |
| KR100450160B1 (en) | 2004-09-30 |
| WO1996033589A3 (en) | 1996-12-27 |
| CN1242631C (en) | 2006-02-15 |
| CN1496150A (en) | 2004-05-12 |
| BR9608327A (en) | 1999-02-23 |
| KR100470374B1 (en) | 2005-03-16 |
| US6259915B1 (en) | 2001-07-10 |
| WO1996033589A2 (en) | 1996-10-24 |
| CA2217650A1 (en) | 1996-10-24 |
| KR20040004450A (en) | 2004-01-13 |
| AU5412696A (en) | 1996-11-07 |
| KR19990007833A (en) | 1999-01-25 |
| KR20040000429A (en) | 2004-01-03 |
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